Ncert Exercises & Solutions

Match the items of Column I with items of Column II.

	Column l (Name of Reaction)		Column ll (Description of Reaction)
A.	Reimer-Tiemann reaction	I.	Conversion of phenol to o-hydroxysalicylic aid
B.	Kolbe's reaction	II.	Heated copper at 573K
C.	Conversion of 2 $°$ alcohol to a ketone	III.	Reaction of an alkyl halide with sodium alkoxide
D.	Williamson's synthesis	Iv.	Conversion of phenol to salicylaldehyde

Codes:

	A	B	C	D
1.	II	III	IV	I
2.	III	IV	I	II
3.	I	IV	III	II
4.	IV	I	II	III

Hint: Williamson's synthesis reaction is used to make an ether.

A. On treating phenol with chloroform in the presence of NaOH, an aldehydic group is introduced at the ortho position of the benzene ring. The reaction is as follows:

B. In Kolbe’s reaction, 2-hydroxy benzoic acid (salicylic acid) is prepared by the reaction of phenol with ${CO}_{2}$ gas.

SOLVED] Explain Kolbe's reaction with an equation.

C. When a 2° alcohol is allowed to pass overheated copper at 573 K, dehydrogenation takes place and a ketone is formed.

$R - CH - R' \to_{573 K}^{Cu} R - C - R$
$I$ $∥$
$OH$ $O$

D. Williamson synthesis is an important method for the preparation of ethers. In this method, an alkyl halide is allowed to react with sodium alkoxide.

R—X +R—ONa $\to$ ROR + NaX

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